Ultrasonic Avocado Oil Extraction
- Ultrasonic extraction and malaxation increases the yield during avocado oil production.
- Sonication is a gentle non-thermal process and thereby is appropriate to produce the highest grade of avocado oil.
- The ultrasonically assisted oil pressing improves yield, maintains high oil grade and increases the oil extraction significantly.
Ultrasonic Oil Extraction and Malaxation
Ultrasonic extraction is a well established process to produce high quality edible oils (e.g. olive, flaxseed, grape seed, algae, coconut etc.) as well as active compounds (e.g. phytochemicals, antioxidants, vitamins, colorants etc.). To maintain the nutritional quality of the plant raw material, a mild and non-thermal extraction technique is crucial. Ultrasonic extraction and malaxation is a non-thermal treatment, which increases yield whilst preserving the phytochemical structure of the extract.
Ultrasonic processing assists the cold-pressing of avocado oil by increasing the oil yield. The non-thermal pressing technique results in avocado oil that retains its valuable nutritional composition, full-flavoured aromatics, and intense emerald green color.
Ultrasonic malaxation and extraction of avocado pulp improves the oil release and potentially decreases the malaxation time in industrial avocado oil production without having quality impacts.
- high quality avocado oil
- higher yield
- non-thermal process
- faster extraction
- low investment
- fast RoI
Carefully ultrasonically pressed avocado oil maintains – in contrast to warm-pressing procedures – all its healthy nutritional compounds such as vitamin, enzymes, micronutrients, and flavor components.
Avocado Oil Production
The production of avocado oil is very similar to the production of olive oil. Avocado oil is produced from de-pitted and de-skinned avocados. For the oil pressing process, only the avocado flesh (puree or pulp) is used. Afterwards, the flesh is ground to avocado pulp and then malaxed for approx. 40-60 minutes at 45-50°C.
The ultrasonic processor can be easily integrated into any existing avocado oil extraction line in order to improve the oil pressing so that a higher amount of oil from same amount of the raw material is recovered.
Besides the production of cold-pressed high-quality edible oils, sonication can be applied to the downstream processing of the avocado oil, e.g. by emulsifying the avocado oil with water-based components for salad dressings, sauces or even cosmetic products. Click here to learn more about ultrasonic emulsification!
Ultrasonic Avocado Oil Extraction Systems
Hielscher Ultrasonics supplies ultrasonic processors and extractors for the production of high quality edible oils. Hielscher’s ultrasonic systems can be easily integrated into the pressing / malaxation lines of extra virgin and virgin avocado oils.
For the integration into the pressing line of avocado or olive oil, Hielscher’s UIP2000hdT (2kW) or UIP4000hdT (4kW) are the most frequently chosen systems. They are equipped with sonotrodes and flow cell reactors accordingly to the raw material (avocado pulp) and processing capacity.
All our ultrasonic systems are built for the 24/7 operation under demanding conditions. Fulfilling industrial grade, Hielscher`s ultrasound transducers can be installed in dusty and/or moist environments.
Hielscher Ultrasonics’ industrial ultrasonic processors can deliver very high amplitudes. Amplitudes of up to 200µm can be easily continuously run in 24/7 operation. The robustness of Hielscher’s ultrasonic equipment allows for 24/7 operation at heavy duty and in demanding environments.
Contact us today to discover the benefits of ultrasonically assisted avocado oil pressing!
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- Antonia Tamborrino, Agnese Taticchi, Roberto Romaniello, Claudio Perone, Sonia Esposto, Alessandro Leone, Maurizio Servili (2021): Assessment of the olive oil extraction plant layout implementing a high-power ultrasound machine. Ultrasonics Sonochemistry, Volume 73, 2021.
- Agnese Taticchi, Roberto Selvaggini, Sonia Esposto, Beatrice Sordini, Gianluca Veneziani, Maurizio Servili (2019): Physicochemical characterization of virgin olive oil obtained using an T ultrasound-assisted extraction at an industrial scale: Influence of olive maturity index and malaxation time. Food Chemistry Volume 289, 15 August 2019, Pages 7-15.
- Servili M; Veneziani G.; Taticchi A.; Romaniello R.; Tamborrino A.; Leone A.(2019): Low-frequency, high-power ultrasound treatment at different pressures for olive paste: Effects on olive oil yield and quality. Ultrasonics Sonochemistry 59, 2019.
- Dreher, Mark L.; Davenport, Adrienne J. (2013): Hass Avocado Composition and Potential Health Effects. Crit Rev Food Sci Nutr. 2013 May; 53(7): 738–750.
- Gutte, Krishna B.; Sahoo, Akshaya K.; Ranveer, Rahul C. (2015): Effect of Ultrasonic treatment on extraction of fatty acid profile of flaxseed oil. Oilseeds & fats Crops and Lipids, 2015.
- Hashemi, Seyed Mohammad Bagher; Khaneghah, Amin Mousavi; Akbarirad, Hamid (2016): The Effects of Amplitudes Ultrasound-Assisted Solvent Extraction and Pretreatment Time on the Yield and Quality of Pistacia Khinjuk Hull Oil. J. Oleo Sci. 65, (9) 2026. 733-738.
- Liu, Dan; Vorobiev, Eugène; Savoire, Raphaëlle; Lanoisellé, Jean-Louis LANOISELLÉ (2011): Extraction of polyphenols from grape seeds by unconventional methods and extract concentration through polymeric membrane. 11th International Congress on Engineering and Food (ICEF) Athens, Greece. May, 22-26, 2011.
- Sicaire, Anne-Gaëlle; Abert Vian, Maryline; Fine, Frédéric; Carré, Patrick; Tostain, Sylvain; Chemat, Farid (2016): Ultrasound induced green solvent extraction of oil from oleaginous seeds. Ultrasonics Sonochemistry Vol. 31, 2016. 319-329.
Facts Worth Knowing
Ultrasonic extraction (also referred to as sono-extraction) is a well-known, reliable method to release components from biological material (e.g. oils, essential oils, aromatics, antioxidants, nutritional compounds). Ultrasonically generated cavitation perforates or breaks the cell wall so that the intracellular material – e.g. valuable compounds such as oils, flavours, vitamins, colorants – are released. Ultrasonic extraction is a highly effective and efficient method and is widely used to extract in the commercial production of oils and active substances from plant material (e.g. fruits, herbs, nuts, seeds, leaves) for the production of supreme plant extracts for the pharmaceutical, nutraceutical, cosmetic, and food industry.
The production of avocado oil is very similar to the production of olive oil. To obtain avocado oil, ripe avocados are peeled and the stone (seed) is removed. Afterwards, the flesh is ground to avocado pulp and then malaxed for approx. 40-60 minutes at 45-50°C.
Extra Virgin Avocado Oil
Like extra virgin olive oil, cold-pressed avocado oil is unrefined and so retains the flavor and color characteristics of the fruit flesh.
Avocado oil is graded regarding its quality: Besides extra virgin avocado oil, other grades such as virgin avocado oil, pure (= refined) avocado oil as well as blends are available. All avocado oils, which aren’t extra virgin, are usually extracted at elevated temperatures. For these latter oils, additional process steps and/or chemical solvents are applied to obtain the oil from the avocados.
The refining process of vegetable oils influences the oil’s smoke point, shelf-life & stability, color, flavor, acidity as well as the composition (nutritional profile). During the refining process, natural waxes are stripped from the avocado oil. This leads to a higher smoking point. Avocado oil has an exceptional high smoking point: The smoke point of the unrefined oil is 480°F (249°C) and the refined form can withstand temperatures of up to 520°F (271°C). The exact smoke point depends on the quality of oil refinement and the oil handling and storage before its use.
Avocado oil functions well as a carrier oil for other flavors. It is high in monounsaturated fats and vitamin E. Avocado oil also enhances the absorption of carotenoids and other nutrients.
Extra virgin avocado oil is the only grade of avocado oil that contains significant amounts of the antioxidant vitamin E. Furthermore, other beneficial phytochemicals and polyphenols are preserved by the gentle cold-pressing resulting in a high quality oil.
The avocado (also known as alligator pear) refers to fruit, which grows on the avocado tree (Persea americana). Botanically, the avocado fruits is classified as a large berry containing a single large seed.
There are various types of avocados on the market. The ‘Hass’ is the most common cultivar of avocado. It produces fruits year-round and provides approx. 80% of cultivated avocados for the world market.
Other common cultivars of avocado are known as Choquette, Lula, Gwen, Maluma, Lamb Hass, Pinkerton, Reed, Fuerte, Sharwil, Zutano, Bacon, Ettinger, Sir Prize, and Walter Hole.
Avocado is often referred to as superfood since it provides a lot of healthy fats, vitamins and micronutrients.
Being a fruit, avocados have a remarkably high fat content: 71 to 88% of their total calories are from avocado’s fat content. However, the avocado is known for its healthy fat composition, which consists of 71% monounsaturated fatty acids (MUFA), 13% polyunsaturated fatty acids (PUFA), and 16% saturated fatty acids (SFA), which help to promote healthy blood lipid profiles and enhance the bioavailability of fat soluble vitamins and phytochemicals from the avocado or other fruits and vegetables, naturally low in fat, which are consumed with avocados. (Dreher et al. 2013)
Avocados are high in pantothenic acid, dietary fiber, vitamin K, copper, folate, vitamin B6, potassium, vitamin E (α-tocopherol), vitamin C, -carotene and lycopene. They are naturally free from sodium, sugar and cholesterol.